Relief-grip for cables.



J. H. CoLBY, RELIEF GRIP FOB VILAJBLES. APILIOATION FILED Nov. 1,1907.

Patented sepe, 29,1908.

'1, ffy-2 ce O y i f 1 UNITED STATES 'PATENT OFFICE.

No. 899,786. Specification oi Letters Patent. Patented Sept. 29, 1908. Application led November 1, 1907. Serial No. 400,812. To all whom it may concern: i of the body portion is provided rin G to Be it known that I, JOHN H. COLBY, a which the log or load of logs is attached. v citizen of the United States, residing at a are back stop pins for links D, and Zi is Luffenholtz, in the county of Humbolt and a stop pinfor grip block B.

5 State of California, have invented certain X is the cable drived by any suitable 60 new and useful Improvements in Reliefpower. Grips for Cables, of which 4the following is a The operation is as follows: The links D in their upright position against back pins a y invention relates to gripping devices eXert no pressure upon grip block C. Su

especially designed and adapted for conneotpose now a log or load of logs is attached to 65 principal object of the invention is to links D. This shortens the ri ht line disthe ody portion, and causes pressure upon block C which grips the cable. If the load should travel faster than the cable, the links are tilted back again and the grip on the cable relieved. It will thus be seen thatt e gripping and relieving action isentirely automatic more fully appear from a consideration of the following description, taken in connection with the accompanying drawings, in which` igure 1 is a side view in elevation of a 5 device constructed according to my invention; Fig. 2 is alongitudinal section through t e same; Fig. 3 is a plan view of the same; and Fig. 4 is a cross-section through the same taken between the links.

Referring to the drawings, A is the body portion formed with a series of inclined surfaces a.

B is a grip block capable of longitudinal movement and having friction pieces b enga ing inclined surfaces a. A second grip lock C coperates with block B, and is also capable of longitudinal movement.

loc C is provided, on its upper surface, with inclined surfaces c at the forward and lower end of each of which is an abutment c.

In order to exert gripping pressure upon the. blocks B and C, I provide what I term a automatically adjust themselves to the changed conditions by reason of the in- It will e understood that the number of links may be varied, and many other chan es made in the details of construction without at I claim as new, and desire to secure by Letters Patent of the United States, is`

In a gripping device, a body portion, cooperating grip blocks formed to en age a cale t ere etween, and parallel tilting links each pivote'd to said body portion and exerting pressure to bring said grip blocks into gripping action, substantially as described.

n a gripping device, a body portion, copperating grip blocks formed to engage a cae therebetween, and parallel tilting links exerting pressure to bring said grip blocks .nd over the grip blocks. Pins d', which into gripping action automatically when the onstitute the upper ends of links D, and cable starts, substantially as described.

lso pins d, are locked to the side plates of 3. In a gri ping device, a body portion, co-

Pie links by turn buttons d2 and rest against operating grip blocks formed to en age a cabutments c. b e therebetween, 1parallel tilting inks em- 105 Guide plates E for the gr'p blocks are sebracing said grip b ocks and pivoted to said ired to the forward end of the body portion, body portion, and stops to limit the move- 1d are provided with perforations e for sto ment of said links in one direction, substanns w en necessary. At this end also II) ovide a stop shackle F. At the rear end 4. In a gripping device, a body portion, co-

operating grip blocks formed to engage a cable therebetween, and parallel acting pressure means compri ing links pivoted to said body portion and engaging a grip block at points the same distance apart as said pivots to bring said blocks into gripping action when tilted, substantiallyT as described.

5. ln a gripping device, a body portion, a grip block upon said body portion, a secon grip block capable of longitudinal movement and having an abutment, and link mechanism pivoted to said body portion and resting against said abutment, saidlink mechanism being tilted upon forward movement of said second grip block and exerting pressure thereon, substantially as described.

6. ln a gripping device, a body portion formed with a series of inclined surfaces, a grip block capable of longitudinal movement and having friction parts engaging said surfaces, a coperating grip block, and means for exerting pressure upon said second grip block to bring the same into gripping action, substantially as described.

operating grip blocks formed to engage a ca- 3. ble therebetween., tilting` comprising links having pivots connecting with said body portion and engaging one of said grip blocks, said pivots being grooved at their outer ends, and turn buttons on said 40 links engaging the grooves of said pivots, substantially as described.

Cil

7. in a gripping device, a body portion 2 formed with a series of inclined surfaces, a orip block capable of longitudinal movement tand having friction parts engaging said surfaces, a second grip block capable of longitudinal movement, and tilting mechanism piv- 30 oted to said body portion and exerting pressure to bring said grip blocks into gripping action, substantially as described.

8. In' a gripping device, a body portion, eo-

link mechanism In testimony whereof l have allixed my signature, in presence of two witnesses.

JOHN H. COLBY.

itnesses i EDMUND BOND, J. H. G. Wmvun. 

